1985 | OriginalPaper | Buchkapitel
Swab and Surge
verfasst von : Alun Whittaker
Erschienen in: Theory and Applications of Drilling Fluid Hydraulics
Verlag: Springer Netherlands
Enthalten in: Professional Book Archive
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Swab arid surge pressures, caused by moving the drillstring axially, can be calculated by a method similar to that used for calculating annular circulating pressures (Section 7). The greatest problem is determining fluid flow-rate in the annul us when the pipe is open-ended since the distribution of flow between pipebore and annulus cannot be found by any simple method.